桩板结构加固病害库岸挡墙稳定性研究*

采用Plaxis有限元分析软件，研究桩板结构加固病害库岸挡墙的稳定性，并定量分析了库岸挡墙整体稳定安全系数随水位的变化规律。结果表明采用桩板结构加固病害库岸挡墙能有效控制墙体变形，显著提高稳定安全系数。库岸挡墙的整体稳定安全系数并不随水位的升高一直降低，而是呈显著的下凹型，即在设计低水位和设计高水位间存在一个最不利水位，可以通过有限元方法进行搜索。该方法克服了因水位选择不当而错误确定挡墙最小安全系数的缺点，建议在重要水工结构计算中推广使用。

Stability of diseased retaining wall of reservoir bank reinforced by pile-plank structure

Based on finite element software Plaxis, this paper researches the stability of diseased retaining wall of reservoir bank that reinforced by pile-plank structure, and analyses the change rules of its safety factor with water level. The results show that using pile-plank structure to reinforce the diseased retaining wall of reservoir bank can effectively control the displacement of wall, obviously improve the safety factor. And the safety factor does not always reduce with the rise of water level , but presents a significant sunken type, that is the most adverse water level between the low water level and high water level, it can be find out with finite element method. The method proposed in this paper overcomes the shortcomings that safety factor of the retaining wall is not minimum for choosing wrong water level, and it is proposed to be used in calculations of important hydraulic structures.